@cubix Q1's circuitry does the RIAA work. I'm not interested in working out the details for that aspect. So I'll ignore it. Q2 and Q3 are in class-A. You can see something similar in something I wrote here at the section subtitled: one class-A 2-quadrant approach. The output stage of your circuit is more interesting (and better) as it uses a bootstrapping C6. Q1 is in the same topology where I called it Q4 in my circuit, but it serves more purposes in your circuit (RIAA.) Q3 in my circuit is gone but C5 is the Miller cap in both cases.
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